PVC-U (Unplasticized Poly Vinyl Chloride) hollow-wall internal-screw sound absorbing tube and preparation method thereof

Abstract

The invention discloses a method for preparing a PVC-U (Unplasticized Poly Vinyl Chloride) hollow-wall internal-screw sound absorbing tube, comprising the following steps of: (1) preparing an extrusion die, wherein the die cavity of the extrusion die is a cylinder of which two ends are open, the inner surface of the cylinder is provided with a plurality of grooves at even intervals along the center direction of the die cavity, a plurality of ribs are evenly arranged at even intervals in the peripheral direction in the cylinder, the inclining direction of the ribs can be adjusted, and therefore the thicknesses of the inner wall and the outer wall of the hollow-wall internal-screw sound absorbing tube can be adjusted according to design requirements; and fixing the extrusion die on an extruder; (2) proportioning materials: and mixing PVC resin, thermostabilization lubricating agent, filler, processing aid and pigment in ratio; (3) mixing materials; (4) charging; (5) extruding and plastifying; (6) pulling out the plastified PVC resin from the extrusion die by a traction apparatus; (7) rotating; (8) cooling and shaping; and (9) cutting the shaped tube according to the required length. The invention also discloses a PVC-U hollow-wall internal-screw sound absorbing tube.

Description

technical field [0001] The invention relates to pipes, in particular to a method for preparing a PVC-U hollow-wall inner spiral sound-absorbing pipe and a hollow-wall inner spiral sound-absorbing pipe prepared according to the method. Background technique [0002] In the prior art, with the development of society and the advancement of science and technology, people are gradually pursuing a higher quality of life, especially higher and higher requirements for sleep quality, and cannot bear the noise of running water at quiet nights. Therefore, how to reduce the noise of running water pipes - rigid polyvinyl chloride silencer pipes came into being. The PVC-U silencer pipe allows the water to flow freely and continuously along the inner wall of the pipe in a spiral shape, and rotates the drainage to form the best drainage conditions, thereby playing a good role in energy dissipation at the bottom of the standpipe and reducing noise. At the same time, the unique structure of t...

AI Technical Summary

Problems solved by technology

In order to further reduce the noise of running water, some PVC pipe manufacturers in my country have painstakingly studied on the basis of PVC-U spiral silencer pipes, but the noise reduction effect and the quality of the pipes are not very ideal, and the set goals cannot be achieved.

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